18163390631 has 8 divisors (see below), whose sum is σ = 19257722784. Its totient is φ = 17071936000.

The previous prime is 18163390621. The next prime is 18163390633. The reversal of 18163390631 is 13609336181.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18163390631 is a prime.

It is a super-2 number, since 2×18163390631² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18163390633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 706370 + ... + 731631.

It is an arithmetic number, because the mean of its divisors is an integer number (2407215348).

Almost surely, 2^18163390631 is an apocalyptic number.

18163390631 is a deficient number, since it is larger than the sum of its proper divisors (1094332153).

18163390631 is a wasteful number, since it uses less digits than its factorization.

18163390631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1438761.

The product of its (nonzero) digits is 69984, while the sum is 41.

The spelling of 18163390631 in words is "eighteen billion, one hundred sixty-three million, three hundred ninety thousand, six hundred thirty-one".